To open and close a door by operation at a small angle of rotation in a lever for opening and closing the door, to handle a lock device easily even by the aged or a physically handicapped person particularly and to improve the safety of the lock device.
The lock device consists of a lever receiving member A having an operating cam 2, being composed of a rotary section rotated by a door knob and being used for opening and closing a door, a latch member D, in which a latch head section 12 is formed at the front end of a latch shaft 11 with a collar section 13, an intermediate cam B turned by the operating cam 2 for the lever receiving member A for opening and closing the door and a lever member C having an abutted section 7 abutted against the intermediate cam B and a pushing section 8b engaged with the collar section 13 of the latch member D. A contact point with the intermediate cam B is brought near to a rocking pivotal support section 9 in the lever member C at that time.
JPH05256058 | BATHROOM DOOR |
JPH09209622 | TUBULAR TYPE LOCK |
JPS59114382 | DOOR LOCK |
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